Answer to Question #307481 in Computer Networks for ING

Question

1. How is the transfer of frames in ethernet similar to the transfer of frames in a packet-switching network? How is it different?

2. what are functions of session layer and presentation layer in the HTTP protocol.

3. Can a connection-oriented, reliable message transfer service be provided across a connectionless packet network? Explain. 

4. Does Ethernet provide connection-oriented or connectionless service? Justify your answer.

Answer 1

1.The main difference between a packet and a frame is the association with the OSI layers. While a packet is the unit of data used in the network layer, a frame is the unit of data used in the OSI model's data link layer. A frame contains more information about the transmitted message than a packet.

2.Some functions of the presentation layer include character-code translation, data conversion, data encryption and decryption, and data translation. The session Layer is responsible for fetching or receiving data information from its transport layer and further sends data to presentation layer.

3.Yes. The connectionless datagram transfer service can be implemented by simply setting up a connection across the network each time a datagram needs to be transferred.

4.Ethernet is connectionless. Upper layer protocols like TCP establishes connection. Connection is implemented through software and connection oriented Ethernet is also there but by default Ethernet is connectionless.